<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>React 组件API setState</title>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>

<div id="example"></div>
<script type="text/babel">
class Counter extends React.Component{
  constructor(props) {
      super(props);
      this.state = {clickCount: 0};
      this.handleClick = this.handleClick.bind(this);
  }
  
  handleClick() {
    this.setState(function(state) {
      return {clickCount: state.clickCount + 1};
    });
  }
  render () {
    return (<h2 onClick={this.handleClick}>点我！点击次数为: {this.state.clickCount}</h2>);
  }
}
ReactDOM.render(
  <Counter />,
  document.getElementById('example')
);
</script>

</body>
</html>